Periclase
Category	Oxide mineral
Chemical formula	MgO
Identification
Color	Colorless, grayish white, yellow, brownish yellow, green, black
Crystal habit	Granular, generally occurs as anhedral to subhedral crystals in matrix
Crystal system	Isometric - Hexoctahedral
Cleavage	{001} perfect; {111} imperfect, may exhibit parting on {011}
Fracture	Brittle to conchoidal
Mohs Scale hardness	6
Luster	Vitreous
Optical Properties	Isotropic
Streak	White
Specific gravity	3. A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes In Mineralogy, shape and size give rise to descriptive terms applied to the typical appearance or habit of Crystals The many terms used by mineralogists A crystal system is a category of Space groups which characterize Symmetry of structures in three dimensions with Translational symmetry in three directions Cleavage, in Mineralogy, is the tendency of crystalline materials to split along definite planes creating smooth surfaces of which there are several named types In the field of Mineralogy, fracture is a term used to describe the shape and texture of the surface formed when a Mineral is broken The Mohs scale of mineral hardness characterizes the scratch resistance of various Minerals through the ability of a harder material to scratch a softer material Lustre (or luster) is a description of the way light interacts with the surface of a Crystal, rock, or Mineral. The streak (also called powder color) of a Mineral is the Color of the powder produced when it is dragged across an unweathered surface Specific gravity is defined as the ratio of the Density of a given solid or liquid substance to the density of water at a specific temperature and pressure typically 67 - 3. 9
Diaphaneity	Transparent to translucent
Other Characteristics	Fluorescent, Long UV=light yellow.
References	[1][2][3]

Periclase occurs naturally in contact metamorphic rocks and is a major component of most basic refractory bricks. Metamorphic rock is the result of the transformation of an existing rock type the protolith, in a process called Metamorphism, which means "change A refractory is a material that retains its strength at high Temperatures ASTM C71 defines refractories as "non-metallic materials having those chemical and physical It is a cubic form of magnesium oxide (MgO). The cubic crystal system (or isometric) is a Crystal system where the Unit cell is in the shape of a Cube. Magnesium oxide, or magnesia, is a white solid Mineral that occurs naturally as Periclase and is a source Magnesium (mægˈniːziəm is a Chemical element with the symbol Mg, Atomic number 12 Atomic weight 24 Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the

The old term for the mineral is magnesia. Stones from the Magnesia region in ancient Anatolia contained both magnesium oxide and hydrated magnesium carbonate as well as iron oxides (such as magnetite). Magnesia on the Maeander is an ancient Greek city in Anatolia, located on the Maeander river upstream from Ephesus, near the town of Germencik Anatolia (Anadolu Ανατολία Anatolía) or Asia minor, comprising most of modern Turkey, is the geographic region bounded by the Black Magnesium carbonate, MgCO3 is a white Solid that occurs in nature as a Mineral. Altogether there are sixteen known Iron Oxides and oxyhydroxides Magnetite is not to be confused with Magnesite or Maghemite. Magnetite is a ferrimagnetic Mineral with chemical Thus these stones, called Stones from Magnesia in antiquity, with their unusual magnetic properties were the reason the terms magnet and magnetism were coined. A magnet (from Greek grc μαγνήτης λίθος " Magnesian stone" is a material or object that produces a Magnetic field. In Physics, magnetism is one of the Phenomena by which Materials exert attractive or repulsive Forces on other Materials. Periclase is usually found in marble and pure periclase is colorless.

References

---

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic